Sign of times: MLB gives OK to electronic pitch calling
Dan Bellino, MLB umpire who ejected Madison Bumgarner, apologizes
MLB Umpire Microphones in Action as 2022 Season Nears - Crew Chief
MLB Umpire Microphones in Action as 2022 Season Nears - Crew Chief
MLB umpires should be mic'd up to explain reviews and ejections
MLB umpire reportedly tests positive for COVID-19 - Sports Illustrated
Umpires may soon wear microphones to explain replay rulings - NBC
Umpire curses on hot mic during Giants-Padres game: video
1999-2023 MLB Umpire Rosters, Post Season and All Star Game Crews
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MLB Umpire Microphones in Action as 2022 Season Nears - Crew Chief
MLB News: Umpires To Wear Microphones During On-Field Reviews
MLB Umpires to Explain Calls via Microphone in 2020